I'd make a much more radical proposal: image support.
We certainly want this. Someone needs to design the format
in Info, and then implement the support in Emacs and in Makeinfo.
I think the images should be stored in separate files,
so that they won't make the Info files bigger or require changes
in the other aspects of the Info implementations.
I suspect that will also be the easiest thing to implement in
Makeinfo. Karl, do you agree?